2015-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/695667摘要：急遽的工業化及土地開發，造成各地區河口及沿岸海洋重金屬與各類有機物汙染，也成為今日全球海洋面臨之嚴重惡化之環境及生態問題。數十年來，砷汙染問題不斷浮現，除了關注其在毒性及健康上之危害外，砷之生物地球化學循環也為科學上聚焦之重點議題。砷在自然水體中，過去認為主要以五價砷（As(V), HAsO42-）及三價砷（As(III), HAsO32-）及其他一些有機砷(如甲基砷)等形式存在，但是近年來，其以膠體及奈米粒子等物種存在的諸多研究證據逐漸浮現。另外，吾人亦發現生物作用也轉換不同砷物種在海洋中型態及反應行為。這些生物性或物理化學性的變化，增加了砷物種在海洋生地化研究之複雜度。本計畫欲透過從河口以至開放海域之砷物種研究，了解不同砷物種從河到海之輸送及轉換反應，並希望得知砷與海洋懸浮顆粒、膠體、有機物及浮游生物之交換作用，最終了解砷在海洋環境之循環控制機制，以及河流輸入海洋之通量。<br> Abstract: During the past few decades, highly industrialization and urbanization, accompanied by an increase in heavy metal pollution together with organic pollution in the estuary, and coastal environments, have been a critical problem in global ocean. Due to widespread pollution and its toxicity, the distribution and environmental behavior of Arsenc has received major attentions in recent studies. In nature waters, As presents in various oxidation states, such as arsenate (As(V), HAsO42-), arsenite (As(III), HAsO32-), or even organoarsenic compounds such as methylated arsenic, these forms of As also contain colloidal and nano-particle phases. The involvements of biota further complicate its speciation due to those various organo-arsenic metabolites. These diverse species increases the difficulty in elucidating the arsenic cycling in the ocean. This proposal will focus on the transformation and transportation processes, the reaction kinetics of As from estuarine waters through coastal to open ocean environments, on their association with suspended particles, colloids, organic matter, and interaction with plankton. In all, the pathways and fluxes of As in these environments will be established.砷台灣海峽南海西太平洋ArsenicTaiwan StraitSouth China SeaWestern Pacific